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Dynamic Abbrev Expansion
The abbrev facility described above operates automatically as you
insert text, but all abbrevs must be defined explicitly. By contrast,
"dynamic abbrevs" allow the meanings of abbrevs to be determined
automatically from the contents of the buffer, but dynamic abbrev
expansion happens only when you request it explicitly.
Expand the word in the buffer before point as a "dynamic abbrev",
by searching in the buffer for words starting with that
For example, if the buffer contains `does this follow ' and you type
`f o M-/', the effect is to insert `follow' because that is the last
word in the buffer that starts with `fo'. A numeric argument to `M-/'
says to take the second, third, etc. distinct expansion found looking
backward from point. Repeating `M-/' searches for an alternative
expansion by looking farther back. After the entire buffer before
point has been considered, the buffer after point is searched.
Dynamic abbrev expansion is completely independent of Abbrev mode;
the expansion of a word with `M-/' is completely independent of whether
it has a definition as an ordinary abbrev.
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